San Francisco-based Uber made no mention of its efforts in self-driving vehicles, particularly trucks for cargo or deliveries.

Uber acquired commercial transport-focused tech startup Otto late last year as the company pressed ahead with its pursuit of self-driving technology.

Google parent Alphabet in February filed a lawsuit accusing Uber and its self-driving vehicle unit Otto of stealing technology from Waymo, the former Google car division.

The suit contends that Waymo manager Anthony Levandowski took technical data with him when he left to launch a competing venture that went on to become Otto.

Mr Levandowski, a co-founder of 90-person startup Otto, was put in charge of Uber's efforts to develop self-driving technology for personal driving, delivery and trucking.

The case is making its way through the court, but a partial injunction issued by a US district court judge ordered Uber to do everything in its power to prevent information taken from Waymo from being used at the on-demand ride company and to return all copies to Waymo, or the court, by the end of this month.